Polian's problem is that he didn't have a successor plan in place for the OL. In the early 2000s it was a great line. Tarik Glenn, Saturday, Scott, Diem, Lilja, DeMulling, all in their prime. By 2010, if not sooner, Lilja, Diem, and Saturday were getting old, Glenn, Scott, Peko and DeMulling were gone - and we didn't have guys waiting in the wings to take over. Hell, it wasn't until Castonzo was picked that they even found a replacement for Glenn. That was about a 4 year gap of failures.
Various starters on that line in the last 5-6 years of Polian's tenure:
Mike Pollack, Charlie Johnson (was good depth but never a true starter), Kyle Devan, Tony Ugoh, Jeff Linkenbach, Joe Reitz (another good depth but never a true starter).
And all these guys actually started. Look at the depth chart:
Seth Olsen, Mike Tepper, Quinn Ojinakka, Michael Toudouze, Jamey Richard, Jaimie Thomas, Jacques Mclendon.
I could go on, but if that isn't a depressing list of O-lineman, I don't know what is.
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